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Q.

Select the correct combination.

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a

Animal  - Frog ; Heart - Three-chambered ; Circulation - Complete double

b

Animal  - Fish ; Heart - Two-chambered ; Circulation - Single

c

Animal  - Crocodile ; Heart - Three-chambered ; Circulation - Incomplete double

d

Animal  - Pigeon ; Heart - Four-chambered ; Circulation - Single

answer is B.

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Detailed Solution

Fishes have a two-chambered heart and their blood circulation is sigle circulation. Frogs have a three-chambered heart. Crocodiles have a four-chambered heart. Double circulation occurs in pigeons (Aves).
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